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Baculites lomaensis
Taxonomy
Baculites lomaensis was named by Anderson (1958). It is a 3D body fossil. Its type locality is CAS Loc. 2361 - Joaquin Ridge [Ragged Valley Shale], which is in a Maastrichtian marine shale in the Ragged Valley Shale Formation of California.
Synonymy list
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Baculites lomaensis Anderson 1958
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. Matsumoto 1959 | The shell is small, being about 15 mm. in height(i.e. longer dia- meter)in the probable adult stage. Tapering is rapid in the earlier growth- stages, gradually becoming slow in the later. The section is trigonal, higher than broad, broadest in the dorsal (i.e, antisiphonal) part, flattened on the dorsal area, subangular at the dorsolateral shoulder, slightly convex on the nanks, which are remarkably convergent, and very narrowly arched or almost fastigate on the siphonal area. In early growth-stages, with heights of 3-7 mm., the shell is relatively broad, inflated on the sides, rounded on the antisiphonal area, and subtrigonal in section. The young shell is smooth up to a height of about 5mm.;then widely spaced, weak nodes are developed on the flank near the dorsolateral shoulder; finally in the later growth-stages these nodes beco]me strong and crescentic, extending to arcuate, short ribs on the Hank and also sometimes to faint ribs on the dorsal area. The arcuate ribs fade out on the siphonal area, where very weak, numerous riblets or striae are sometimes discernible, forming sharp chevrons. On the dorsal area the weak ribs and growth-lines show very broad convexity and occasionally obtuse chevrons. The suture is moderately incised;the saddles are broad and subrectangular in general outline. The saddle between L and U is somewhat broader than the one between L and E, except in the very young stage. The stem of L is much narrower than those of the adjacent saddles, At the bottom of L the secondary branches are moderately deep;the top of the median minor saddle is distinctly lower than the tops of the adjacent, lateral, minor saddles. These three minor saddles are nearly of equal size and end at the phylloid terminals. U is broader and much more asymmetric than L. The antisiphonal saddle is lower and smaller than other saddles. I is narrow, but becomes fairly deep in the later growth-stage. In the latest growth-stage minute incisions are added to all the secondary divisions of the elements, resulting in a fairly ornate suture. |